body {
    margin: 0px;
}

h1 {
    text-align: center;
}

.hidden {
    display: none;
}

.button {
    padding: 20px;
    background: #fff;
    border-radius: 4px;
    cursor: pointer;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
    margin-bottom: 10px;
}

#wrapper {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 482px;
    background: #fff;
    border-radius: 4px;
    border: 2px solid #ccc;
    display: flex;
}

.left {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    align-items: flex-end;
}

#game-wrapper {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}

.grid_empty {
    width: 26px;
    height: 26px;
    margin: 1px;
}

.grid_fixed {
    width: 26px;
    height: 26px;
    margin: 1px;
    background: #ccc;
}

.grid_move {
    width: 26px;
    height: 26px;
    margin: 1px;
    background: red;
}

.right {
    width: 200px;
    border-left: 1px solid #ccc;
}

.next-square {
    border-bottom: 1px solid #ccc;
    padding: 10px;
}

.next-line {
    display: flex;
}

.score-wrapper {
    border-bottom: 1px solid #ccc;
    padding: 10px;
}

.options {
    border-bottom: 1px solid #ccc;
    padding: 10px;
}

.setting-wrapper {
    display: flex;
}

.down,
.up {
    padding: 10px;
    cursor: pointer;
}

.speed {
    padding: 10px;

}